rbt_rule.h | Explore in Territory

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
* Copyright (C) {1999-2001}, International Business Machines Corporation and others. All Rights Reserved.
**********************************************************************
*   Date        Name        Description
*   11/17/99    aliu        Creation.
**********************************************************************
*/
#ifndef RBT_RULE_H
#define RBT_RULE_H

#include "unicode/utypes.h"

#if !UCONFIG_NO_TRANSLITERATION

#include "unicode/uobject.h"
#include "unicode/unistr.h"
#include "unicode/utrans.h"
#include "unicode/unimatch.h"

U_NAMESPACE_BEGIN

class Replaceable;
class TransliterationRuleData;
class StringMatcher;
class UnicodeFunctor;

/**
 * A transliteration rule used by
 * <code>RuleBasedTransliterator</code>.
 * <code>TransliterationRule</code> is an immutable object.
 *
 * <p>A rule consists of an input pattern and an output string.  When
 * the input pattern is matched, the output string is emitted.  The
 * input pattern consists of zero or more characters which are matched
 * exactly (the key) and optional context.  Context must match if it
 * is specified.  Context may be specified before the key, after the
 * key, or both.  The key, preceding context, and following context
 * may contain variables.  Variables represent a set of Unicode
 * characters, such as the letters <i>a</i> through <i>z</i>.
 * Variables are detected by looking up each character in a supplied
 * variable list to see if it has been so defined.
 *
 * <p>A rule may contain segments in its input string and segment
 * references in its output string.  A segment is a substring of the
 * input pattern, indicated by an offset and limit.  The segment may
 * be in the preceding or following context.  It may not span a
 * context boundary.  A segment reference is a special character in
 * the output string that causes a segment of the input string (not
 * the input pattern) to be copied to the output string.  The range of
 * special characters that represent segment references is defined by
 * RuleBasedTransliterator.Data.
 *
 * @author Alan Liu
 */
class TransliterationRule : public UMemory { … };

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_TRANSLITERATION */

#endif
chromium/third_party/icu/source/i18n/rbt_rule.h
